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  User: dailyblue
  Date: 2024/1/22
  Time: 10:08
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    <title>Title</title>
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<body>
常量：${9} 9 ${'李四'} 李四
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运算符：
${8+7}..${8+'7'}
${9>8}
${true&&false}
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为空运算符：
<br/>
判断A在容器中是否存在：${empty A}
</body>
</html>